Version 18

This release is a smaller one for end-users, but contains a lot of code style and build system changes that should hopefully help developers and packagers.

Keeping the same version name since I've been playing a lot of SFV lately.

What's Changed

• Don't stop deleting on an exception by @ninedotnine in #20
• Replace Pandoc with Ronn-ng and use Rake for build tasks. This increases our reliance on Ruby, but Pandoc is a HUGE dependency so it's nice to drop it.
• Enable DIP 1000 project-wide in preparation of that becoming the new default in D
• Convert project from Spaces to Tabs. Yes, I made a life decision.
• Use CTFE for all the version information, so now only the info in dub.json matters.

Full Changelog: 17...18